Don't know if i can write in english in here, but here it goes. Ok, since Juiz's Unjustice at first glance looks a little like Shen's Untruth, let me explain: Juiz's power doesn't make the opponent do THE EXACT OPPOSITE of the action they were thinking to do (this is what Shen's power does). Instead, she makes the opponent act OPPOSITE TO THEIR OWN VISION OF MORAL AND JUSTICE. So it's not a specific act, she can make the enemy do things they weren't even thinking about it, as long as it goes against what they belief it's "justice / moral". In other words: she can turn a saint into a killer, and vice-versa. Go back to ep 5, when they joined the Union. Tatiana attacked Andy, and when they were about to fight, Juiz used her Unjustice, and Andy's arm (he was holding a sword) moved to Fuko's neck, and Tatiana was about to shoot Billy. It wasn't the "opposite" to what they were about to do, but instead, they were about to attack the person who they are fond of the most.